<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      padding: 0;
      margin: 0;

    }
    ul{
      width: 60px;
      height: 60px;
      border: 5px solid #333;
      border-radius: 4px;
      padding: 10px;
      margin: 100px;
      display: flex;
      justify-content: space-between;
    }
    li{
      list-style: none;
      width: 20px;
      height: 20px;
      background: #333;
      border-radius: 50%;
    }
    li:nth-child(2){
      align-self: center;
    }
    li:nth-child(3){
      align-self: flex-end;
    }
  </style>
</head>
<body>
  <ul>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</body>
</html>